Cam Action T-Track Quick Release Hold Down Clamp for Jigs, Fixtures & Shop Fences. Ideal for Router and Drill Press Table Fences and Many Shop Built Jigs, Sleds and Fixture (1, 5/16" Cam Action Clamp) Finally, a quick release clamping system for jigs, fixtures and fences. Spending a lot of time tightening and loosening knobs on your jigs and fixtures? Or maybe your are constantly rotating knobs on your router table or drill press fences. Our exclusive cam clamps will solve your problem and provide you with a quick release clamping system for all of your jigs, fixtures and some fences that rely on a track system. Having a cam clamp on your router table fence makes is so much easier to make quick adjustments and quickly lock the fence in place. The clamp body is made out of aluminum, measures approximately 1-1/2 long and each clamp has a standard 3 long hex head bolt that works with most standard sizes of t-track (depending on which size Cam Action Clamp you purchase). Be sure to get the correct size for your needs. Typically that means you should check to see what size slot or track you would like to use the clamps in. The Cam Action Clamps are available in  5/16 and 3/8 hex head bolt sizes. Another nice feature of the Cam Action Clamps is that you can swap the bolts out for different situations. For instance, if you have a slot requiring a T-bolt, you can switch out the  hex head bolt with a  T-bolt. Each cam can exert up to 400 pounds of clamp pressure depending on how you set it. Finally, a quick release clamping system for jigs, fixtures and fences. Spending a lot of time tightening and loosening knobs on your jigs and fixtures? Or maybe your are constantly rotating knobs on your router table or drill press fences. Our exclusive cam clamps will solve your problem and provide you with a quick release clamping system for all of your jigs, fixtures and some fences that rely on a track system. Having a cam clamp on your router table fence makes is so much easier to make quick adjustments and quickly lock the fence in place. The Cam Action Clamps are available in  5/16 and 3/8 hex head bolt sizes. Another nice feature of the Cam Action Clamps is that you can swap the bolts out for different situations. For instance, if you have a slot requiring a T-bolt, you can switch out the  hex head bolt with a  T-bolt. Each cam can exert up to 400 pounds of clamp pressure depending on how you set it.